YYSS_4 exp physics 2012 paper 1.doc

7/30/2019 YYSS_4 exp physics 2012 paper 1.doc

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MID-YEAR EXAMINATION 2012

INSTRUCTIONS TO CANDIDATES

Write in soft pencil.

Do not use staples, paper clips, highlighters, glue or correction fluid.Write your Name, Index number and Class on the Answer Sheet in the spaces provided.

There are forty questions on this paper. Answerall questions. For each question there are four

possible answers, A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the separate Answer

Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

Any rough working should be done in this booklet.

The gravitational field strength is 10 N/kg.

Hand in OTAS separately from Question Paper.

___________________________________________________________________________

This question paper consists of 17 printed pages, including this cover page.

1

Name of Pupil : ____________________________________ ( )

Class : _______

Subject / Code : Physics/5058

Paper No. : 1Level : Sec 4 Express

Date : 9 May 2012

Duration : 1 hour

Setter : Mr Soh Wei Yong

Multiple Choice (40 marks)

AnswerALL the questions

Marks

40

65

Marks

40

65


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1. A pendulum swings backward and forward passing through Y, the middle

point of the oscillation.

The first time the pendulum passes throughY, a stopwatch is started. The

forty-first time the pendulum passes throughY, the stopwatch is stopped. The

reading is T.

What is the period of the pendulum?

A T/41

B T/21

C T/20

D T/10

2. A car is travelling with uniform acceleration along a straight road. The road

has marker posts every 100 m. When the car passes one post, it has a speed

of 10 m/s and when it passes the next one, its speed is 20 m/s.

What is the car's acceleration?A 0.67 m/s2

B 1.5 m/s2

C 2.5 m/s2

D 6.0 m/s2

3. When an object falls through the air, the drag force on it increases. The objectreaches terminal velocity. Which quantity decreases until terminal velocity isreached?

A accelerationB air resistanceC speedD weight

2

Y


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4. A car driver steps on the accelerator sharply when the traffic lights turn green.The force on the car varies with time as shown.

Which graph shows the variation of the cars speed with time?

A B

C D

5. An object is accelerating under the influence of a force on a frictionlesssurface. What will happen to the object when an opposing force of the samemagnitude acts on it?

A The object will move in the opposite direction.

B The object will come to rest immediately after the opposing force actson it.

C The object will slow down gradually before it stops moving.

D The object will move at constant velocity.

3

0time

Force

0tim

e

Speed

0tim

e

Speed

0tim

e

Speed

0tim

e

Speed


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ropeF

1.2 m

30

6. The weight of an object is 60 N on Earth. The gravitational field strength on

the Earth is six times the gravitational field strength on the Moon. What is themass and weight of the object on the Moon?

mass / kg Weight / NA 6 10B 6 60C 10 10D 10 60

7. A uniform plank of wood of mass 5.0 kg is used to make a trap door. It ishinged at one end and a piece of rope is attached to the other end. The dooris held in the position shown. What is the force F exerted on the rope?

A 12.5 N

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B 21.7 N

C 25.0 N

D 50 N

8. A box of mass 6 kg is being pulled by a 50 N force from an initial speed of

4 m/s at the foot of the ramp to a final speed of 6 m/s at the top of the ramp.What is the magnitude of friction along the ramp is 2 N?

A 2.5 m B 3.4 m

C 4.5 m D 6.0 m

9. The diagram shows a manometer used to measure the pressure of the gas ina chamber.

Assuming the atmospheric pressure is 76 cm Hg, what is the pressure of thegas?

A 60 cm Hg B 62 cm Hg

C 92 cm Hg D 106 cm Hg

5

Gas

30 cm

14 cm

50 cm

mercury


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10. The diagram shows a Utube filled with mercury with some air trapped in theleft limb. The length dof the trapped air varies when the right limb moves upor down. At a particular instant, dis 10 cm and difference in mercury levels

between the limbs h is 8.0 cm.

Given that the atmospheric pressure is 760 mmHg, what is the length of thetrapped air when h is 16 cm?

A 5.0 cm

B 9.1 cm

C 9.9 cm

D 12.8 cm

11. Illuminated smoke particles, suspended in air, are viewed with a microscope.

They are seen to move randomly.

This is because the smoke particles are

A bombarded continually by air molecules.

B moved about by convection currents

C shaken by the vibration of the molecules within them.

D supplied with energy by the light illuminating them.

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dh mercury


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12. The outlet of a glass syringe is sealed so that air is trapped below themoveable piston. The syringe is placed in hot water as shown and the pistonbegins to rise. The piston comes to a stop after some time.

How do the speed of the air molecules and their rate of collision with thepiston compare with their initial values at the lower temperature after thepiston has moved up?

speed of molecules rate of collision

greater greater

greater reduced

greater same

same greater

13. The e.m.f. of a thermocouple with one junction P in pure melting ice and theother junction Q in steam from water boiling at standard atmospheric pressureis 6.2 mV. When Q is next placed in another boiling liquid the e.m.f. is 10.8mV. What is the temperature of the boiling liquid?

A - 0.57 oC

B - 174 oC

C 0.57 oC

D 174oC

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P

Q

R

S

0 10 20

50

100

14. The resistance of a piece of wire in pure melting ice is 600 . The resistanceof the wire at 180 C is 900 . What is the resistance of the wire at 60 C,assuming that resistance changes uniformly with temperature?

A 660

B 700

C 720

D 750

15. Aluminium foils are commonly used to wrap sweet potatoes which are to becooked in a barbecue fire. How should the sweet potatoes be wrapped if thealuminium foil has one side that is more shiny than the other side?

A The dull side should be on the outside because it is a better conductor.

B The dull side should be on the outside because it is a better absorber

of radiation.

C The shiny side should be outside because it is a better conductor.

D The shiny side should be on the outside because it is a better absorber

of radiation.

16. Four liquids P, Q, R and S, of the same mass are heated at the same rate.The graph shows the variation of their temperatures with time.

8

time / min

temperature / C


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Which liquid has the highest specific heat capacity?

A P B Q

C R D S

17. An aluminium cube of mass 2.0 kg at 700 C is placed in 2.0 kg of water at

20 C. What is the mass of water that will be vaporized ?

The specific heat capacities of aluminium and water are 900 J/(kg C) and4 200 J/(kg C) respectively.

The specific latent heat of vaporisation for water is 2.26 x 106 J/kg.

A 0.09 kg B 0.18 kg

C 0.27 kg D 0.36 kg

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18. A beam of green light is shining through a triangular glass block. The glassblock is an equilateral triangle as shown in the figure below. What is therefractive index of the glass block?

A 1.44 B 1.39

C 1.04 D Not enough information is given

19. The diagram shows how light travels through the optical fibre of anendoscope.

Which of the following statements is true?

A Some light is lost through the optical fibre when total internal reflectionoccurs.

10

A

B

B


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B The angle of incidence in the optical fibre is equal to the critical angleofA.

C The refractive index of A is greater than the refractive index ofB.

D The refractive index of B is greater than the refractive index ofA.

20. The diagram below shows two incoming parallel light rays 1 and 2 which passthrough a thin converging lens. Which of the points A, B, C orD (directlybelow A) will the light ray 3 pass through, if it is allowed to pass through thelens?

21. A straight vibrator is used to make waves in a ripple tank. One crest isproduced every 0.2 seconds. The diagram below shows the cross-section ofthe water waves at a particular instant with a cork at P.

If the wave is moving to the right, what will be the position of the cork 0.1seconds later?

A P B Q

C R D S

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wave motion


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22. The figure below shows a wave generator which makes 5 oscillations asecond. It is used to produce waves in a ripple tank. Which of these is correctfor the waves produced?

Frequency / Hz Wavelength / cm Speed / cm s-1

A 0.5 12 6

B 5 3 15

C 0.2 3 0.6D 5 12 240

23. The figure below shows a water wave in a ripple tank. The wave has a speed of0.5 m/s at R. The water waves cross a boundary PQ where the distancebetween successive crests changes from 0.05 m to 0.025 m. What is thevelocity of the wave at point S?

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A 0.0 m/s B 0.25 m/s

C 0.5 m/s D 1 m/s

24. A monkey stands at a distance from a flat cliff. It claps two wooden bananasat the moment it hears the echo of the previous clap. It is found that it claps

10 times in each 2 second interval. What is the distance of the monkey from

the cliff? (Speed of sound in air = 340 m/s)

A 17 m B 34 m

C 51 m D 68 m

25. The figure below shows a progressive longitudinal wave formed in a slinkyspring by an oscillator connected to a signal generator.

Which distance correctly identifies the wavelength of the longitudinal wave?

26. Which of the following has the electromagnetic waves arranged in increasingwavelength?

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A microwave, infrared ray, ultraviolet ray, X-ray

B ultraviolet ray, microwave, infrared ray, X-ray

C X-ray, ultraviolet ray, infrared ray, microwave

D X-ray, infrared ray, microwave, ultraviolet ray

27. A positively charged rod is brought close to a suspended conducting ballwhich is positively charged as shown in the diagram below.

Which of the following diagrams correctly represents the forces on the ball?

A B

C D

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28. An uncharged insulator is placed between two oppositely charged parallelplates as shown in the figure below. Which of the following diagramsrepresents correctly the field pattern inside the space between the two plates?

29. An electric cell has an electromotive force of 2 V. If it is connected in a circuit

where there is 2 A of current flowing, calculate the amount of energy itdissipates in 1 minute.

A 4 J B 120 J

C 160 J D 240 J

30. A tungsten wire of length L, and cross-sectional area A, has a resistance of R.

Henry uses another piece of tungsten wire of the same length with cross

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sectional area 2A and cuts it into 5 equal pieces. Find the resistance of eachpiece of wire in terms of R.

A 0.1 R B 0.4 R

C 5 R D 10 R

31. Three similar light bulbs are connected to a constant-voltage d.c. supply asshown in the figure below. Each bulb operates at normal brightness and the

ammeter (of negligible resistance) registers a steady current.

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If the filament of one of the bulbs breaks, what happens to the ammeterreading and to the brightness of the remaining bulbs?

Ammeter reading Bulb brightness

A Increases Increases

B Increases Unchanged

C Decreases Unchanged

D Decreases Decreases

32. Three identical lamps X,Y and Z are connected as shown.

What happens to the brightness ofX andY when switch k is closed?

X Y

brighter brighter

brighter dimmer

dimmer brighter

stays the same dimmer

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33. A light dependent resistor (LDR) and a 500 resistor form a potential dividerbetween voltage lines at +30 V and 0 V as shown below.

The resistance of the LDR is 1000 in the dark but drops to 100 in brightlight. What is the corresponding change in the potential atY?

A a decrease from 20 V to 5 V

B a decrease from 25 V to 10 V

C an increase from 5 V to 20 V

D an increase from 10 V to 25 V

34. In the circuit, three similar resistors are connected as shown. When switch Sis open as shown, the ammeter and voltmeter show their readings.

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When S is closed, what would happen to the ammeter and voltmeterreadings?

ammeter reading voltmeter reading

increases increases

increases decreases

decreases increases

increases remains unchanged

35. The circuit shows 3 light bulbs and a thermistor connected to a cell.

19

L1 L2

L3


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What will happen to the brightness of bulbs L1, L2 and L3when the thermistoris heated?

L1 L2 L3

A increases decreases decreases

B decreases increases decreases

C increases decreases no change

D decreases increases no change

36. An electric oven rated at 1.2 kW operates from a 240 V mains. What is the

correct fuse rating for its plug to be connected to the mains socket?

A 4 A B 6 A

C 190 A D 210 A

37. In the table below shows appliances that were used for different time intervalson an average day:

Appliance Power Usage per day

Television 100 W 4 hr

Five lamps 60 W each 6 hr

Air Conditioner 3 kW 5 hr

Electric kettle 750 W 40 mins

If electricity costs 15 cents per kWh, calculate the total cost for one month of30 days.

A $ 2.44 B $ 73.20

C $ 79.70 D $ 212.40

38. Which of the following proves that a piece of metal is already a magnet?

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A A magnet is attracted to it.

B Copper wire is attracted to it.

C Both ends of a compass needle are attracted to it.

D One end of a compass needle is repelled by it.

39. The diagram below shows a solenoid connected by batteries.

Which of the following statements concerning this solenoid is/are CORRECT?

(1) B is the north pole of the solenoid.

(2) The magnetic field strength increases when the number of turns on thesolenoid increases.

(3) The magnetic field strength increases when the soft iron core isreplaced by an aluminium core.

A (1) and (2) only

B (1) and (3) only

C (2) and (3) only

D All of the above

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40. Which diagram correctly shows the magnetic field patterns between the endsof three bar magnets?

A

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B

C

D

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YYSS_4 exp physics 2012 paper 1.doc